TITLE: GCN CIRCULAR NUMBER: 23226 SUBJECT: GRB 180914B: AGILE/MCAL detection of a burst DATE: 18/09/14 22:37:55 GMT FROM: Alessandro Ursi at INAF/IAPS GRB 180914B: AGILE/MCAL detection of a burst A. Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, Y. Evangelista, G. Minervini, G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS), M. Marisaldi (INAF/OAS, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team: The AGILE Mini-CALorimeter (MCAL) detected a long burst at T0 = 2018-09-14 18:23:02.22 +/- 0.01 s (UTC). The event lasted T90 = 5.8 s (in the 0.4-100 MeV energy range), consisting of two broad pulses, and released a total number of ~25,000 counts in the detector, above an average background rate of ~1250 counts / s. Further analysis is still in progress. The AGILE-MCAL detector has a full solid angle acceptance, and is operational in the range 0.4 - 100 MeV.